Merriam-Webster Collegiate Dictionary - strength

 noun  (plural ~s)  Etymology: Middle English ~e, from Old English ~u; akin to Old High German strengi strong — more at strong  Date: before 12th century  1. the quality or state of being strong ; capacity for exertion or endurance  2. power to resist force ; solidity, toughness  3. power of resisting attack ; impregnability  4.  a. legal, logical, or moral force  b. a strong attribute or inherent asset the ~s and the weaknesses of the book are evident  5.  a. degree of potency of effect or of concentration chili peppers in varying ~s  b. intensity of light, color, sound, or odor  c. vigor of expression  6. force as measured in numbers ; effective numbers of any body or organization an army at full ~  7. one regarded as embodying or affording force or firmness ; support you are my love and my ~  8. maintenance of or a rising tendency in a price level ; firmness of prices the ~ of the dollar  9. basis — used in the phrase on the ~ of  Synonyms: see power